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.ac3 and .dts, Insight into formats
chanakyasun
post Feb 1 2011, 06:41
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How will be the structure of files with extention .ac3 , .dts , .dtshd?

How is the Metadata (artist , trach, album) stored in these formats?

are there any special container formats for .ac3 and .dts? sad.gif


I found information telling about dolby digital .....

I need overview on these audio formats Pls



Regards
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saratoga
post Feb 1 2011, 06:53
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I think they're just raw compressed audio streams. I don't think either is widely tagged, although its possible something out there can stick ID3 tags on them.
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chanakyasun
post Feb 1 2011, 07:50
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QUOTE (saratoga @ Feb 1 2011, 07:53) *
I think they're just raw compressed audio streams. I don't think either is widely tagged, although its possible something out there can stick ID3 tags on them.


if they're just raw compressed audio streams , i have doubt as following
there are different dolby digital or dts audio techiniques like dolby digital plus, dts-es, dts-master audioHD ...
how will we know that the content in side the audio file.
How different are these audio formats?
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mjb2006
post Feb 1 2011, 08:19
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May I suggest doing some simple web searches? For relatively non-technical comparisons of AC-3 and DTS, try searching for "ac-3 dts comparison".

For technical details about each of the formats, here is what I did:

1. I searched for "AC-3" in Google.
2. I clicked on one of the top results: the Wikipedia article on Dolby Digital.
3. I skimmed the article and noticed at the bottom there was a link to the standard. I clicked on it. I arrived at a site that had a PDF of the standard.

As for DTS, that standard is not available for free. However, with a search for "open-source DTS decoder", you can find open-source DTS (and AC-3!) decoder software which you could study and learn from. e.g. libdts, libdca, and AC3Filter.
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saratoga
post Feb 1 2011, 17:12
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QUOTE (chanakyasun @ Feb 1 2011, 01:50) *
how will we know that the content in side the audio file.


I don't think you do until you decode it. But no one uses raw streams so its not an issue. They're always in some other container.

QUOTE (chanakyasun @ Feb 1 2011, 01:50) *
How different are these audio formats?


Rather different. AC3 is a conventional if extremely primitive MDCT encoder like AAC or Vorbis. DTS is a subband coder like MP2 or MPC. DTS-AudioHD or whatever they call it is (IIRC) a hybrid lossy/lossless codec more like wavpack.
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benski
post Feb 1 2011, 18:17
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QUOTE
How will be the structure of files with extention .ac3 , .dts , .dtshd?

as bitstreams, according to the spec

QUOTE
How is the Metadata (artist , trach, album) stored in these formats?

it's not

QUOTE
are there any special container formats for .ac3 and .dts? sad.gif

there are other containers which often contain them, like AVI, MPEG-2 Transport Stream, MPEG-2 Program Stream, Matroska, MP4 (as private streams) and WAV/AIFF, amongst many many others. These container formats can contain many other things, also.
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chanakyasun
post Feb 2 2011, 08:09
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QUOTE (benski @ Feb 1 2011, 18:17) *
How is the Metadata (artist , trach, album) stored in these formats?

Is it possible to embedd ID3 tags in .dts or .ac3 formats?

Thanks and Regards biggrin.gif
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Kohlrabi
post Feb 2 2011, 09:20
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A possible solution is to mux AC3 or DTS into Matroska. Good audio players should be able to handle MKV/MKA and read metadata from these files.


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